#11313: Animated GIF plots should repaint bgcolor after each frame
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Reporter: kini | Owner: jason, was
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: graphics | Keywords: plot, animate, imagemagick
Work_issues: | Upstream: N/A
Reviewer: | Author: Keshav Kini
Merged: | Dependencies:
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Old description:
> As title. !ImageMagick should be called with `-dispose Background`,
> because when you create an animation, Sage first creates a bunch of
> frames, then uses !ImageMagick to make an animated GIF out of them. If
> the frames are not all the same size, then !ImageMagick determines the
> minimum size for the final GIF in which it is possible to accommodate all
> the frames. The default behavior is to simply draw frame n over frame n-1
> without erasing frame n-1. When frame n's image is smaller than frame
> n-1's image, however, you get garbage in frame 'n' outside the borders of
> the original image used to create frame 'n'.
New description:
As title. !ImageMagick should be called with `-dispose Background`,
because when you create an animation, Sage first creates a bunch of
frames, then uses !ImageMagick to make an animated GIF out of them. If the
frames are not all the same size, then !ImageMagick determines the minimum
size for the final GIF in which it is possible to accommodate all the
frames. The default behavior is to simply draw frame `n` over frame `n-1`
without erasing frame `n-1`. When frame `n`'s image is smaller than frame
`n-1`'s image, however, you get garbage in frame `n` outside the borders
of the original image used to create frame `n`.
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Comment(by kini):
Sorry about the spam...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11313#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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